They’ve been annoying customers for years with this sort of nonsense.  I don’t think there is a way to turn it off.

Resolution for 'annoying issue: 'how do I delete QB ads' available: Yes.

The annoying issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the annoying issue yourself by looking for a resolution described in the article. If it is a complex annoying issue or you are unable to solve the issue, you may contact us by clicking here or by using other annoying support options.

For more information about resolving issues related to annoying in Quickbooks/QBO or to get support for the issue 'how do I delete QB ads', click the link below: